When considering outsourcing services, there are four basic types of products, host IP PBX, manageable IP PBX, web-based services and IP centralized user switches, all of these services is the basic premise of a third party management every things and provide services to the agency, however, there is a difference between these services, however, the user is not lose the direct control of the solution, even if you are a DIY IT organizations have influence, you also want to consider for small branch and remote office staff provide hosting service USES a mixed environment, which may focus more on your site easier to upgrade to VoIP,
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